roussy



2 SheetsSheet 1.

(No Model.)

B. L. ROUSSY.

INOANDESOENT ELECTRIC LAMP.

No. 319,129. Patented June 2, 1885.

(No Model.) 2 Sheets-Sheet 2.

E. L. ROUSSY.

INGANDESOENT ELECTRIC LAMP.

No. 319,129. Patented June 2, 1885.

Ek' Z) a x12 L .71 I L 7 a Fig.5

N. PETERS, Phowunw m ner, Washington, D. c.

UNITED STATES PATENT OFFICE.

EMILE LOUIS ROUSSY, OF VEVAY, SYVITZERLAND.

INCANDESCENT ELECTRIC LAM P.

SPECIFICATION forming part of Letters Patent No. 319,129, dated June 2, 1885.

Application filed April 26, 1884. (No model.)

To aZZ whom it may concern:

Be it known that I, EMILE LoUIs RoUssY,

of Vevay, Switzerland, have invented an Improvement in Regulators for Electric Incandescent Lamps, of which the following is a specification.

A regulator for electric incandescent lamps has heretofore been made consisting of a column of carbon disks occupying a recess in the lamp-holder and connected in the lamp circuit. These carbon disks couldbe more or less compressed by means of a screw to vary the resistance of the column of disks and the consequent intensity of the light.

In practice it has been found that the heat developed by the passage of the electric current causes the carbon disks to expand, and as the column of disks cannot lengthen the expansion causes the disks to press more intimately against each other, thereby lessening the resistance of the column and causing the luminosity of the light to be greater than that for which the regulator was set.

Finely-divided carbon has been used as a resistance in electric lighting circuits, and it has been found that the heat developed by the electric current in a column of finely-divided carbon under'pressure does not lessen the re sistance of that carbon to the same extent that a like column of carbon disks will lessen under the same conditions.

My invention consists of a lamp-holder for incandescent electriclamps made of insulating material and having a cavity to receive a column of finely-divided carbon. This cavity is closed by a clip-plate, to which one of the electric conductors is connected, and a metal screw passes through the clip-plate and presses upon the column of carbon, and there is a metal screw or plug to close the inner end of the cavity containing the carbon. A key of usual construction is provided for opening and closing the lamp-circuit.

In the drawings, Figure 1 is an elevation of the lamp, lampholder, and regulator as applied to an Edison lamp; Fig. 2 is a sectional elevation of the same. Fig. 3 is a plan of the upper end of the holder. Fig.4 is a sectional plan of the holder at the circuit-closer. Fig. 5 is a sectional elevation, and Fig. 6 is a sectional plan showing my improvement as applied to a Swan lamp.

The lamp-holder x is of glass, porcelain, or other suitable insulating material, and it is provided with a socket at its lower end to receive the upper end of the lamp. In Fig. 2 there is shown in this socket a cylinder of sheet metal, f, having a screw-thread formed therein for the screw-collar 9 upon the lamp. In Fig. 5 the spring q is secured within this socket, and the lampis suspended by the wires f g, having hooks passing into loops upon the wire ends of the carbon filament p, as usual in the Swan lamp.

0, Figs. 2 and a, is a plug closing an opening formed in the holder, and through this plug the circuit-wires pass. After the wire connections are made the plug is firmly secured in place by cement or otherwise. There is a cylindrical recess in the holder 90 for the column of finely-divided carbon In Fig. 2 this recess is in the central portion of the upper part of the holder, and in Fig. 5 it is within a hub projecting from the side of the holder.

It is a screw passing through a nut in the clip-plate d,with its lower end pressing against the carbon i, and by turning this screw in one direction or the other the finely-divided carbon is more or less compressed and its resistance varied to vary the intensity of the light. The clip-plated has clip-pieces d projecting from its edge, and these clip-pieces are turned down around a bead formed upon the holder and firmly secure the clip-plate in place. One of the electric conductors is connected to this clip-plate.

m, Fig. 2, is a metal screw held in place by a nut in the bottom of the recess for the powdered carbon, and when the circuit-closing key 7; is in the position shown in said Fig. 2 one part of the cam portion, Z, of the key is in contact with m and the other portion is in contact with the metal piece n, that is connected with one limb of the filament p, the other limb being connected with the metal collar 9. The current passes from the circuit-wire a, bindingscrew a, wire 2, clip (1, screw h, carbon 13, screw m, key 70, metal piece a, carbon filament p, collar g, screw f, and wire 3 to bind ing-post b and circuit-wire I).

In Figs. 5 and 6 the circuit-closing key is made as a metal rod having a spring, o,around its reduced portion for projecting the rod when the cam-leverk is turned to ti o position shown, thereby causing the tapering end of the rod to make contact with the metal pieces 0' a and close the circuit, the current passing from a 2 d h z" m f g n 7c 0 3 to I).

I claim as my invention- I The combination, with the electric lamp I pressing upon the resistancecolumn, a circuitclosing key, a metal screw or plug, m, closing the inner end of aforesaid. cavity, and conducting-wires so arranged that one of the conductors is connected with the clip-plate and the other with the lamp, substantially as and EMILE LOUIS RQUSSY.

\Vitnesses:

CONRAD F. Hermann, FRITZ VUILLEUMIER. 

